Heroes of Might and Magic IV Duel Tournament: "Honor and Blood"

You could replace random monsters with fixed ones, but then some of the uniqueness would be lost.

Ah... I asked the Equi-team if it was possible to add a flag to a monster, such as "from the castle" or "not from the castle." They didn't answer me...

Added 3 minutes later
We need to strengthen beavers, corpses, and nature...
What if we gave nature and corpses a stack (or half a stack) of level 4 units, and beavers an additional stack of level 1 units (or the same)?